
Structure for the Realization of DT Systems 1 BIU - LIU: Dr. Hijazi
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•Major factors that influence our choice of a specific realization are:
Computational complexity: Number of arithmetic operations (multiplications,
divisions, and additions), number of a fetch from a memory and number of
comparison between two numbers (programmable DSP chips) required to compute
an output value y(n).
Memory requirements: Number of memory locations required to store the system
parameters, past inputs, past outputs, and any intermediate computed values.
Finite-word-length effects or finite-precision: Due to quantization effects (in
hardware or in software), the parameters of the system must necessarily be
represented with finite precision and the computations of an output from the
system must be rounded off or truncated to fit within the limited precision
constraints of the computer or the hardware used in the implementation.
Other factors: Such as whether the structure lends to parallel processing or whether
the computations can be pipelined. These additional factors are usually important
in the realization of more complex digital signal processing algorithms.